Most frightning landings for me are (but being a passenger I don't realy know of course if the situation realy was all that dangerous)
1) Madrid Barajas airport. Comin in from Santiago de chili (Chile) in a 747. Aproach was in a thunderstorm with no visibility at all. I was seated in the back of the plane near the galley. With gear and flaps out I felt a sudden jolt that was much harder then the others (flying through a thunderstorm you've got alot of jolts), I believed the plane veered left but I'm not sure because I had no reference... outside was grey/black. A stewardess behind me in the galley seats began weeping and panicking, a colleague comforted her. That got me worrying a bit, since if they start panicking it sure isn't a normal aproach. Landing came sudden, I thought we were in a turn when we touched down. After the landing the captain told us that we had been hit by lightning on final aproach (gear and flaps out).
2) La Paz airport Bolivia. Not a special landing as in dangerous but because it felt like he kept engine throttle very high during approach. After thought... he should have ofcourse, landing at 13000 feet

3) Juarez Mexico City airport is also a nice one. Mexico city being surrounded by high vulcanoes, and at an alt of 6000 feet.
Then again, I'm sure that every commercial airline pilot must have had some close calls in his career.